Simulation

CorsixTH

Open source clone of Theme Hospital

Sken

Endless Sky

Space exploration and combat game

Sken

FlightGear

A free and highly sophisticated flight simulator

Sken

Julius

Julius is an open source re-implementation of Caesar III

Sken

Minetest

Multiplayer infinite-world block sandbox game

Sken

OpenRCT2

A construction and management simulation video game that simulates amusement park management

Sken

OpenTTD

A highly detailed transport simulation game

Sken

Powder Toy

Physics sandbox game

Sken

Search and Rescue II

Rescue Helicopter Simulator

Sken

Taigo

Taigo is a virtual pet for your desktop

Sken

Voxelands

The Fun-Focused Free Software Voxel World Game

Sken